168 
CRUSTACEA. 
Atelecyclus, Leach * * * § . 
Fcssulae of the intermediate antennae longitudinal ; lateral antennae 
elongated, salient and composed of many joints, but very hairy as 
well as the claws; the latter strong, and with compressed hands. 
The third joint of the foot-jarvs sensibly narrowed above, resembling 
an obtuse or rounded tooth ; conical tarsi, and the ocular pedicles 
of the ordinary size. The tail is longer than in the preceding Crus- 
tacea. 
Two species have been described f. One from the coast of 
England, of a sub-orbicular form, and the other from that of 
France, Mediterranean, as well as Oceanic. The 
Thia, Leach, 
Approaches Atelecyclus in the lateral antennae, in the direction of 
the fossulse, in which the intermediaries are placed, in the form of 
the third joint of the external foot-jaws, and in the sub-orbicular 
shell; but the eyes, together with tlie pedicles, are extremely small 
and scarcely salient. The tarsi are strongly compressed and sub- 
elliptical. The front is arcuated, rounded, and without any marked 
dentations. The pectoral space between the feet is very narrow, 
and of the same breadth throughout. The clarvs are much weaker in 
proportion. The shell is smooth, and in some respects the Thiee 
approach the Leucosice and the Corystes. 
The type J of this subgenus, whose habitation was unknown, 
has been discovered by Milne Edwards in the sandy shores of 
the Mediterranean, near Naples. Risso — Journ. de Phys., 1822, 
p. 251, — described a second, dedicated to M. de Blainville, which 
he found in the river at Nice. The 
Mursia, Leach §. 
Of which but a single species is known, and which is peculiar to 
that part of the Ocean which bounds the southern extremity of 
Africa, approaches the Matutse and several Portuni, in the long spine 
with which each side of the shell is armed posteriorly ; it also 
approximates to the true Crabs in the form of the shell, and of the 
external foot-jaws, with this difference, that their third joint forms 
an elongated square, narrowed and obliquely truncated at its supe- 
rior extremity ; but, as in the Calappse and Hepati, the hands are 
strongly compressed above, having a sharp and dentated edge, re- 
sembling a crest II . 
H EPATUs, Latr. 
The Hepati have a considerable affinity with the true Crabs in the 
* We had, at first, placed this subgenus, as well as the following one, among the 
Orbicularia. 
t See Consid. G^n^r. sur la Classe des Crust., Desinar., p. 88, 89. 
t Thia poli/u, Leach, Zool, Miscell. ciii. 
§ This name must be changed to avoid confounding the division with that of 
Nitrsia, another subgenus. 
II Desinarest, ConauL Gencr., &c., IX, 3. 
